Index of /archives/graphics/ImageMagick/image-bank/16bit840x840images
Name Last modified Size Description
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![[TXT]](/icons/text.gif)
wave.txt 2012-04-23 00:49 3.5K
footbridge.txt 2012-05-29 04:30 9.6K
frog.txt 2012-05-29 04:32 31K
garland.txt 2012-05-29 04:35 26K
boy.txt 2012-05-29 23:51 22K
baby.txt 2012-05-29 23:51 20K
cat.txt 2012-05-29 23:52 16K
man.txt 2012-05-29 23:56 8.0K
shed.txt 2012-05-29 23:58 9.4K
tower.txt 2012-05-29 23:59 9.4K
cabins.txt 2012-05-30 02:34 25K
dragon.txt 2012-05-30 02:36 13K
horse.txt 2012-05-30 02:38 24K
paint.txt 2012-05-30 02:39 28K
wreck.txt 2012-05-30 02:42 27K
curios.txt 2012-06-02 05:30 8.9K
apartments.txt 2012-06-04 01:15 5.7K
README 2012-06-09 01:20 7.9K
![[DIR]](/icons/folder.gif)
images/ 2019-10-14 07:19 -
thumbnails/ 2019-10-14 07:19 -
==================================
16bit840x840images test image bank
==================================
Version 1.9999 (2012.06.08)
16bit840x840images is a small digital test image bank.
General "flavour" of the images: 16-bit sRGB v2 Perceptual
uncompressed TIFF low noise natural images with a significant area in
sharp focus and low sharpening artifacts, resulting from careful
downsampling to 840x840 of DSLR photographs and of one archival
quality scan.
The test images are:
apartments.tif
baby.tif
boy.tif
cabins.tif
cat.tif
curios.tif
dragon.tif
footbridge.tif
frog.tif
garland.tif
horse.tif
man.tif
paint.tif
shed.tif
tower.tif
wave.tif
wreck.tif
(Note that the curios image distributed with versions < 1.9 of the
test image bank, and the apartments image distributed with versions <
1.99, were different.)
Inspect the images. Don't use them blindly. The authors make no claim
regarding the suitability of the test images for any purpose.
Test images are in the images folder. JPEG thumbnails are in the
thumbnails folder. The top level contains this README file and .txt
files that detail the licensing and preparation details of the test
images.
All images are 840x840 16-bit sRGB (v2) uncompressed TIFF images
produced with Perceptual rendering intent.
840 was chosen as width and height because it is the least common
multiple (lcm) of 2, 3, 4, 5, 6, 7 and 8. Consequently, all images can
be exactly box downsampled by these ratios, and enlarging back the
reduced versions with the "align corners" image geometry convention
using these integer ratios produces images with the original 840x840
dimensions.
An sRGB v2 profile, sRGB_IEC61966-2-1_black_scaled.icc, was chosen
because sRGB v2 is the most commonly used profile family. This black
scaled profile, tuned for Perceptual rendering, can be downloaded from
http://www.color.org/srgbprofiles.xalter. This profile is
representative of recent vintage profiles used by many image
processing software utilities.
Perceptual rendering intent was chosen because it generally clamps
less than alternatives; it is also the most commonly used.
Uncompressed TIFF was chosen so that performing lots of operations on
these images does not incur much decompression overhead.
Except for boy.tif and wave.tif, the images were obtained by
converting DSLR raw using Photivo, RawTherapee, Adobe Photoshop
Lightroom, DxO+Photoshop, RawShooter Essentials or dcraw with mostly
"light touch" settings, finishing off by downsampling with "exact" 2x2
or 3x3 box filtering through the XYZ colourspace or with carefully
aligned Jinc-windowed Jinc 2-lobe EWA (Elliptical Weighted Averaging)
through linear RGB with sRGB primaries, saving with Perceptual
rendering intent with the sRGB_IEC61966-2-1_black_scaled.icc profile
or with the RGB to sRGB direct converter built into ImageMagick. The
boy.tif image was downsampled with "exact" 4x4 box filtering through
the XYZ colourspace straight from the out of camera fine quality 8-bit
JPEG (using the in-camera Nikon software). The wave.tif image, an
archival colour scan, was downsampled with "exact" 5x5 box filtering
through the XYZ colourspace. Processing details are found in the .txt
files (baby.txt for baby.tif etc). Note that processing details may
not be perfectly accurate, and that the various toolchains are not
flawless w.r.t. colour fidelity.
----------------------------------------------------------------------
Authors:
Nicolas Robidoux, Jean-François Avon, Anthony Barnett, John Cupitt,
Jana Duncan, Minglun Gong, Holly Graham, Henry HO, Kirk Martinez,
Michael Muré, Mukund Sivaraman, Adam Turcotte and Luiz E.
Vasconcellos.
----------------------------------------------------------------------
Licensing:
Summary: CC-by
Particulars:
The raw images and the one scan from which the final tif images were
made have various licenses, assigned by their respective authors,
described in the corresponding .txt file: CC-0, Public domain and/or
CC-by. In some cases, the original author also performed the
processing from raw, as indicated.
Specifically:
The raw image from which apartments.tif was made, authored by Henry
HO, is CC-0 (Public domain).
The raw image from which baby.tif was made, authored by Minglun Gong,
is dual Public domain and CC-by.
The original raw and the (full-size) JPEG image from which boy.tif was
made, authored by John Cupitt, are CC-0 (Public domain).
The original raw and the (full-size) TIFF image from which cabins.tif
was made, authored by Anthony Barnett, are CC-by.
The original raw and the (full-size) TIFF image from which cat.tif was
made, authored by Luiz E. Vasconcellos, are CC-by.
The original raw and the (full-size) TIFF image from which curios.tif
was made, authored by Jean-François Avon, are Public domain.
The raw image from which dragon.tif was made, authored by Michael
Muré, is CC-0 (Public domain).
The raw image from which footbridge.tif was made, authored by Jana
Duncan, is CC-by.
The original raw and the (full-size) TIFF image from which frog.tif
was made, authored by Luiz E. Vasconcellos, are CC-by.
The raw image from which garland.tif was made, authored by Mukund
Sivaraman, is CC-0 (Public domain).
The raw image from which horse.tif was made, authored by Kirk
Martinez, is CC-0 (Public domain).
The raw image from which man.tif was made, authored by Holly Graham,
is CC-0 (Public domain).
The original raw and the (full-size) TIFF image from which paint.tif
was made, authored by Anthony Barnett, is CC-by.
The raw image from which shed.tif was made, authored by Jana Duncan,
is CC-by.
The raw image from which tower.tif was made, authored by Jana Duncan,
is CC-by.
The original scan of a reproduction by an anonymous engraver of
artwork by Hokusai Katsushika, from which wave.tif was made, is Public
domain (there are no known restrictions on publication according to
the Library of Congress).
The original raw and the (full-size) TIFF image from which wreck.tif
was made, authored by Anthony Barnett, are CC-by.
-----
The final versions of the images were produced by Nicolas Robidoux and
Adam Turcotte who hereby release their contributions to the final
images and this test image bank under the following license:
Summary licensing for Nicolas Robidoux and Adam Turcotte's processing,
packaging and documentation of the images: CC-0 (Public domain)
To the extent possible under law, Nicolas Robidoux and Adam Turcotte
have waived all copyright and related or neighboring rights
w.r.t. their contributions to the images distributed within the
840x840images test image bank, as well as the bank itself. This work
is published from: Canada.
----------------------------------------------------------------------
Please cite this test image bank
@Misc{16bit840x840images,
author = {Nicolas Robidoux and Jean-Fran\c{c}ois Avon and
Anthony Barnett and John Cupitt and Jana Duncan and
Minglun Gong and Holly Graham and Henry {H}{O} and
Kirk Martinez and Michael Mur\'{e} and Mukund
Sivaraman and Adam Turcotte and Luiz E.
Vasconcellos},
title = {16bit840x840images test image bank},
howpublished =
{\url{http://www.imagemagick.org/download/image-bank}},
month = {May},
year = {2012}}
and Adam Turcotte's Masters thesis EXQUIRES (Evaluative and eXtensible
QUantitative Image Re-Enlargement Suite) implementation and comparison
of resizing methods and difference metrics <TODO: INSERT BIBTEX DATA
HERE WHEN PUBLISHED>.
Special thanks to Cristy, the lead developer of ImageMagick, for
hosting this test image bank.
----------------------------------------------------------------------
Address criticism/suggestions/comments/praise to Nicolas Robidoux
<[email protected]> or post them at the ImageMagick Forum,
for example at
http://www.imagemagick.org/discourse-server/viewtopic.php?f=22&t=20691
or http://www.imagemagick.org/discourse-server/viewforum.php?f=19.